Positive displacement pump of the constant delivery type



H. J. KRATZER 2mm? POSITIVE DISPLACEMENT PUMP OF THE CONSTANT DELIVERY TYPE Filed Dec. 5, 1954 Patented Oct. 19, 1937 POSITIVE DISPLACEMENT CONSTANT DELIVERY PUMP OF THE TYPE Herbert .1. new, St. Louis, Mo. pplication December 5, 1934, SerialNo. 756,035

This invention relates to certain improvements in positive displacement pumps, and has for one of its objects, to provide a reliable and noiseless pump of simple manufacture, and of a large capacity. 7 v

Another object of the invention is to Provide a positive displacement pump wherein there is a minimum of surface friction.

A further object of the invention is to provide a pump of the constant delivery type with improved means in its construction whereby the operative parts compensate for natural wear, thus providing for eificient cperationover a long service life.

A still further object of the invention is -to provide simple mechanism to actuate the vanes or blades of the pump or blower.

Another further object of the invention is to provide a blade type of positive delivery pump with packing means at the inner blade edges.

Other and further objects will appear in the specification and be specifically pointed out in the appended claims, reference being had to the accompanying drawing, exemplifying the invention, and in Which:

Figure 1 is a longitudinal vertical section taken through this improved pump, approximately on the line I-I of Fig. 2.

Figure 2 is a transverse vertical section taken approximately on the line II--II of Fig. 1.

Figures 3, 4 and 5 are sections similar to Fig. 2, on a reduced scale, showing different operating positions of the blades with respect to suction and discharge.

#5 Figure 6 is a transverse vertical section similar 0 prises a cylindrical body to Fig. 2, showing a different embodiment of the invention with respect to the blades.

Referring by numerals to the accompanying drawing, I designates a housing which com- 2 having end walls 3 and l, the. end walls being secured to the body by studs or bolts 5. The body 2 on respective sides ofits vertical longitudinal center, is provided with an intake connection 6 and a discharge connection I, saidconnections paralleling each other and having their ends terminating on the same plane to simplify the machine facing operation of the end surfaces to which the intake and discharge manifolds may be sealingly bolted or attached.

Each of the end walls 3 and 4 is recessed or counterbored'as designated at 8, said counterbores being in longitudinal alinement and are V disposed eccentric to thecylinder of the body 2 of the housing, and are for the reception of re- 'members 9 and I0 rotor II is also spective end members 9 and III of a blade operating rotor II.

The blade operating rotor II comprises the end which are held apart or supported by a series of rods I 2 which are pinned or keyed at their ends to respective end members 9 and I0. Before the rods I2 are secured to and between the end members 9 and La sleeve I3 is provided on each rod, and mounted on each rod is a plurality of spaced pairs The end member 9 of the rotor II is provided with a concentric extension shaft I 6 which extends through the end wall 3 of the housing I and keyed on the extending end of said shaft is a grooved pulley provided with a concentric recess I8 for the reception of a. bearing block I9, said block being for the support of one end of a shaft which is fixed to said block by the pin 2|.

The shaft 20 is longitudinally extended through the housing I concentric thereto and in eccentrlc disposition to the rotor II, the position of said shaft however to the rotor, being within the are or circumference described by the rods I2 of the rotor.

he shaft support of a plurality of hinges 23, each having a leaf extension 24 provided with a pin aperture 25 paralleling the shaft 20.

The hinges 23 and their brackets 24 are for i the support of a plurality of blades 26, said blades being of the approximate length of the distance between the end members 9 and I0 of the rotor I I and of the approximate depth from the periphery 21 to the hub or hearing portions of the hinges, and being secured to the leaf extensions 24 of the hinges in a desired manner, such as by spot welding or riveting.

A packing strip 40 is supported in a bracket 4| at the inner end of each blade 26, said packing.strips being held in resilient contact with the hubs of the hinges 23 by a kinked spring 42 or the like. I I

From the disclosure of the-drawing, it is to be noted that three sets of links I4 are mounted on each rod I 2. Each set of links of a respective rod, at their extending ends, is adapted to be cooperably connected by pins 28 to a respective leaf extension of a hinge 23, by the insertion of a pin in the aperture 25 of the respective leaf extensions.

With this arrangement, there are therefore,

. 20 is provided with a longitudinal sleeve 22, said sleeve and shaft being for the of links it and' 1 0 a spacer member I5 between each pair .of links.

three leaf extensions 24 securedtoeach blade 26, and there are three sets of links M cooperably connecting a respective blade, from a respective rod II.

The end member ID of the rotor II is in the form of a ring, the opening of the ring or end member providing a bearing on the bearing block 29 which is fixedly secured to the shaft 20 by the pin 30, said bearing block also serving to close the eccentric end opening 3| in the end wall 4 of the housing and is fixedly secured against turning by the screw 32.

with further regard to the end members 9 and III of the rotor ll, said end members are adapted to, rotate on respective fixed bearing blocks l9 and 29, and for relief of the bearing wear between said end members and the blocks, bearing bushings 33 are provided. Obviously, if desired, either ball or roller bearings could be used in lieu of the bushings 33.

In operation, a driven belt ismounted over the grooved pulley l1 and the rotor H is revolved in the direction of the arrow 3i, whereby the blades 26 will be caused to alternately communicate with and pass the inlet and exhaust ports of respective connections 6 and I.

By reason of the rotor ll being disposed eccentrically in the housing and the shaft 20 on which the blades 26 are mounted, being disposed concentrically in the housing and in a position within the are described by the rods I! of the revolving rotor, the links M- connecting the hinges of respective blades 26, will become active on respective blades to cause them to in turn travel faster as they pass and leave the inlet port, and to travel slower upon reaching and passing the outlet port.

During revolving of the rotor, the supporting rods I! will be alternately carried towards and away from the fixed shaft 20, thus causing the links II to exert a toggle action on respective blades 26 wherein the peripheral travel of the blades isincreased in efiecting a suction action, and subsequently decreased during a discharge action.

Figs. 2, 3, 4 and 5 of the drawing show the blade positions taken at consecutive partial rotation of the rotor. Fig. 2 illustrates the approximate positions of the blades, which are further designatedas A, B and C, wherein a suction action is taking place in the sector D of the cylinder or housing between the blades A and B, and complete simultaneous discharge is being carried on from the sector E and whereas blade C has just entered the dead sector F. Figs. 3 to 5 inclusive, show the carrying out of intermediate operating stages.

Fig. 2 also shows the position of the rotor when a blade is at each end of the dead sector F, said pair of blades which are designated as B and C, containing a pocket of fluid at prevailing discharge pressure, in said sector. Obviously, the pocketed fluid in the B and C, will be discharged into the intake or suction side of the pump. To provide for the utilization of the energy of the expanding compressed charge from the dead sector F, a lip 35 is extended into the intake connection 6 for its entire width and in a manner to form a clearance passage at the blade tips, for directing the re-expanding compressed fluid from the dead sector into the path of the incoming fluid stream through the intake connection 6, in a direction shown by the arrow 36, thereby assisting the preceding blade by ejector action of the re-expanding compressed sector F between the blades fluid in completing the filling of the housing chamber when the rotor is positioned, as shown in Fig. 4.

The embodiment shown in Fig. 6 provides for a variation of the pump construction wherein four blades 31 and their relatable rod supports 38 and links 39 are employed. This embodiment as' shown, consists in employing bent blades which in their manufacture may be cut from bent stock material, thereby providing the blades of a structure which will present longitudinal rigidity therefor. Blades of this specifically formed structure provide for the use of linkage that will result in decreasing the are between adjacent blades at dead sector, thus resulting in a consequent minimum entrainment of discharge fluid between pairs of blades travelling through the dead sector G, to the suction side of the described my invention so that the art will be able to practice the same, what I desire to secure by Letters Patent is defined in what is claimed, it being understood that various changes in the displacement pump shown and described above in detail and not amounting to invention may be made without departing from the spirit and scope of my invention.

What I claim is:--

l. A pump comprising a housing having an intake port and a lip extended into said port; an eccentrically disposed rotor within the housing; blades concentrically disposed in the housing; and toggle actuating means carried by the rotor having rearward connection with the blades; said lip being disposed outwardly from the inner periphery of the housing and inwardly inclining into the inlet port.

2. A pump comprising a housing having an intake port and a lip extended into said port; an eccentrically disposed rotor within the housing; blades forming parts for the rotor; a fixed support for the inner ends of said blades, disposed concentrically in the housing; and actuating parts for the blades, connected at one end to the rotor and at their other ends to the blades; said lip being of the approximate length of the width of the intake port and inclining inwardly therein.

3. A pump comprising a housing having inlet and exhaust ports; an eccentrically disposed rotor within the housing; a shaft extending through said housing, disposed concentrically therein; a series of blades radially extending from said shaft for cooperation with said ports; a lip of the approximate width of the inlet port and extending in the direction of travel of said blades into the inlet port and being disposed outwardly of the inner periphery of the housing; and actuating means for the blades connected at one end to the rotor and at their opposite ends to respective blades.

4. A pump comprising a housing having inlet and exhaust ports; an eccentrically disposed rotor within the housing; a shaft extending through said housing, disposed concentric therein; hinges on said shaft and radially extending blades each having a groove extending the widtl thereof for the reception of parts of the hinges and actuating means for the blades, connected t1 the rotor and to the parts of said hinges.

5. A pump comprising a housing having inle and outlet ports; an eccentrically disposed roto within the housing; a shaft extending throug] said housing, disposed concentric therein; hinge pump.

Having thus those skilled in on said shaft and radially extending. blades secured to said hinges; each bladebeing bent the length of its width for the reception of parts of the hinges; and links carried by the rotor having their extending ends connected to the parts of said hinges of said blades.

6. A pump comprising a housing having inlet and exhaust ports; an eccentrically disposed rotor within the housing; a fixed concentric shaft in the housing; a plurality of blades each being grooved their longitudinal length; hinges mounted on said shaft and secured to respective blades within the grooves; and swingable means carried by the rotor having connection with said hinges.

7. A pump comprising a housing having inlet and exhaust ports; an eccentrically disposed rotor within the housing; a fixed concentric shaft in the housing; a plurality of blades; hubbed hinges mounted on said shaft and secured to respective blades; swingable means carried by the rotor having straddling connection with and a packing element carried by each blade in contacting relation with the hubs of said hinges.

8. An operating mechanism for displacement purposes comprising a series of circumferentially disposed rods; turnable end members for supporting the rods; a supporting element parallel-.

ing the axis of said end members; blade hinges turnably mounted on said element, blades fixedly connected to said hinges; and connecting members cooperably secured in pairs to the rods and to the hinges of the blades; in straddling relation with the hinges.

9. An operating mechanism for displacement purposes comprising a series of circumferentially disposed rods; turnable end members for supporting the rods; a sleeve mounted on each rod in approximate abutment at posed within the are described by said rods when the end members are revolved; blades connected secured in pairs on the sleeves and to the hinges.

10. An operating mechanism for displacement purposes comprising a series of circumferentially disposed rods, turnable end members for supportnected to the hinges of said element;

said hinges;

rods and to the hinges of the blades; in straddling relation with the hinges.

11. An operating mechanism for displacement purposes comprising a series of circumferentially disposed rods; turnable end members for supporting the rods; a blade supporting element disposed parallel with and offset from the axis of said end members; blades connected with hinges to said element; and connecting members cooperably secured in pairs to the rods and the hinges.

12. An operating devicefor displacement purposes comprising revolvably mounted end members; a. series of circumferentially disposed rods carried bysaid end members; a blade supporting element disposed parallel with and offset from the axis of said end members, blades connected with hinges to said element, and connecting members cooperably secured to the rods and the hinges. V

13. An operating device for displacement purposes comprising turnably mounted end members; a series of circumferentially disposed rods secured at their, ends in said end members; a sleeve mounted on each rod in approximate abutment at its ends with respective end members; a blade supporting element paralleling the axis of said end members and disposed adjacent and within the arc describedby said rods when the end members are revolved; blades connected with hinges to said element, and connecting members cooperably secured on the sleeves of the rods and to the hinges of the blades.

14. An operating mechanism for displacement purposes comprising a series of circumferentially disposed rods; turnable end members for supporting the rods; a supporting element paralleling the axis of said end members; blade hinges turnably supported on said element and each having an extending portion; blades connected to the extending portions of said hinges; and connecting members swingably secured to the rods and to the extending portions of said hinges.

15. A pump comprising a housing having paralleling inlet and exhaust connections having their outer extending ends terminating in the same plane; an eccentrically disposed rotor within the housing; a fixed concentric shaft in the housing; hubbed hinges turnably mounted on said sha'ft having extending parts; aplurality of blades fixed to the extending parts of said hinges; and

swingable links carried by the rotor and having pivotal connection with the extending parts of said hinges.

' HERBERT J. KRATZER. 

